On 11/12/14 9:48 AM, Olafur Gudmundsson wrote:
The usage case that got brought up at the mike “PTR records are used
by logging systems” got me thinking “when does a logging system need
this information” and the answer is I think “when a human is looking
at the log” in all other cases if the system is running at high speed
the delay in looking up addresses is just too long.

In networks with users that have consistent, unique host names, but can get different IP addresses; doing the reverse lookup at the time that the connection occurred is necessary. (Such situations are common in enterprise networks.)

Doug

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